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...e GAMs we're trying to > fit. But being able to switch to atlas temporarily is a good > alternative. Note that switching to openblas-openmp (libopenblaso.so) should be thread-safe and will probably get you a better performance than Atlas. Also, Fedora packages blis (which provides /lib64/blisblas/libblas.so.3). It seems to be thread-safe should be more performant than Atlas too. -- I?aki ?car

...erstand what the difference was (I'm still not clear what the differences are between say openblas-openmp and openblas-openmp64), but I did get R to pass mgcv's thread safe test with both openblas-openmp and blis-openmp, so I have aliased those options for use too. Just using blis ( /lib64/blisblas/libblas.so.3 ) was generating a segfault when running the mgcv test. Really appreciate the help! All the best G On Wed, 27 May 2020 at 14:09, I?aki Ucar <iucar at fedoraproject.org> wrote: > > On Wed, 27 May 2020 at 21:40, Gavin Simpson <ucfagls at gmail.com> wrote: > >...

Of course, even a simpler trick is to launch R as follows: LD_PRELOAD=/lib64/atlas/libsatlas.so.3 R and then the symbols in libsatlas take precedence over libopenblas. Or a mix between both alternatives, i.e., setting LD_PRELOAD=/path/to/some/link R and then change that link to point to openblas, atlas... Whatever suits you best. I?aki On Wed, 27 May 2020 at 11:00, I?aki Ucar <iucar at